Evaluation of the Effect of Geomechanical Parameters and In Situ Stress on Tunnel Response Using Equivalent Mohr-Coulomb and Generalized Hoek-Brown Criteria

The generalized Hoek-Brown (GHB) failure criterion can estimate the rock mass parameters required for mechanics–related analyses such as numerical modeling in geomechanics. determination of GHB has been developed field mechanics. Due to wide use Mohr-Coulomb and lack an existing relationship determining its a mass, equivalent (EMC) be derived from GHB. To determine differences these two criteria, we analyzed behavior deep circular tunnel nine stress states three metamorphic rocks recovered Canadian Shield masses that present very blocky structure. We carried out 241 simulations using finite element code RS2 assess effect geological strength index (GSI), situ stress, type on deviation wall displacement, number yielded elements, differential obtained by EMC parameters. A combination low high GSI similar results when both criteria.